mirror of https://github.com/Icinga/icinga2.git
139 lines
3.4 KiB
C++
139 lines
3.4 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012-2018 Icinga Development Team (https://www.icinga.com/) *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of the License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#ifndef REGISTRY_H
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#define REGISTRY_H
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#include "base/i2-base.hpp"
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#include "base/string.hpp"
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#include <map>
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#include <boost/thread/mutex.hpp>
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#include <boost/signals2.hpp>
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namespace icinga
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{
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/**
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* A registry.
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*
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* @ingroup base
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*/
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template<typename U, typename T>
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class Registry
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{
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public:
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typedef std::map<String, T> ItemMap;
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void RegisterIfNew(const String& name, const T& item)
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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if (m_Items.find(name) != m_Items.end())
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return;
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RegisterInternal(name, item, lock);
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}
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void Register(const String& name, const T& item)
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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RegisterInternal(name, item, lock);
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}
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void Unregister(const String& name)
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{
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size_t erased;
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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erased = m_Items.erase(name);
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}
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if (erased > 0)
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OnUnregistered(name);
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}
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void Clear(void)
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{
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typename Registry<U, T>::ItemMap items;
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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items = m_Items;
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}
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for (const auto& kv : items) {
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OnUnregistered(kv.first);
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}
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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m_Items.clear();
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}
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}
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T GetItem(const String& name) const
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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auto it = m_Items.find(name);
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if (it == m_Items.end())
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return T();
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return it->second;
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}
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ItemMap GetItems(void) const
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{
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boost::mutex::scoped_lock lock(m_Mutex);
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return m_Items; /* Makes a copy of the map. */
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}
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boost::signals2::signal<void (const String&, const T&)> OnRegistered;
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boost::signals2::signal<void (const String&)> OnUnregistered;
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private:
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mutable boost::mutex m_Mutex;
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typename Registry<U, T>::ItemMap m_Items;
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void RegisterInternal(const String& name, const T& item, boost::mutex::scoped_lock& lock)
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{
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bool old_item = false;
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if (m_Items.erase(name) > 0)
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old_item = true;
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m_Items[name] = item;
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lock.unlock();
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if (old_item)
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OnUnregistered(name);
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OnRegistered(name, item);
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}
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};
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}
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#endif /* REGISTRY_H */
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